Butterbean shouldn't be on any list as he was a joke and never fit to compete over 4 rounds.

Cool find though! I think it's a bit misleading to list HW's highest weights, as if coming in fat and out of shape counts for something. Take having Iran Barkley as 2, who did he ever fight above 200 pounds? Guillermo Jones must be one they missed, I know he has fought at 147!

Pacquiao, Duran, Toney and Hearns are the most incredible to me, in that order I think.